package day07;

import java.util.Random;
import java.util.Scanner;

public class CodeDemo {
    public static void main(String[] args) {
        Generatecode();
    }
    public static void Generatecode(){
        Scanner scanner = new Scanner(System.in);
        String code = "";
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x',
                'y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T',
                'U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9','0'};
        Random random = new Random();
        for (int i = 1;i<=4;i++){
            int index =random.nextInt(chs.length);
            code += chs[index];
        }
        System.out.println("输入正确的验证码："+code);
        String num = scanner.nextLine();
        String cod = code.toUpperCase();
        String sca = num.toUpperCase();
        if (cod.equals(sca)){
            System.out.println("验证码正确");
        }else{
            System.out.println("验证码错误");
        }
    }
}
